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Diffstat (limited to 'arch/s390/kernel/smp.c')
-rw-r--r--arch/s390/kernel/smp.c118
1 files changed, 102 insertions, 16 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 8f894d380a62..0aeb290060d9 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -44,6 +44,7 @@
#include <asm/lowcore.h>
#include <asm/sclp.h>
#include <asm/cpu.h>
+#include "entry.h"
/*
* An array with a pointer the lowcore of every CPU.
@@ -67,13 +68,12 @@ enum s390_cpu_state {
CPU_STATE_CONFIGURED,
};
-#ifdef CONFIG_HOTPLUG_CPU
-static DEFINE_MUTEX(smp_cpu_state_mutex);
-#endif
+DEFINE_MUTEX(smp_cpu_state_mutex);
+int smp_cpu_polarization[NR_CPUS];
static int smp_cpu_state[NR_CPUS];
+static int cpu_management;
static DEFINE_PER_CPU(struct cpu, cpu_devices);
-DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
static void smp_ext_bitcall(int, ec_bit_sig);
@@ -298,7 +298,7 @@ static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
/*
* this function sends a 'purge tlb' signal to another CPU.
*/
-void smp_ptlb_callback(void *info)
+static void smp_ptlb_callback(void *info)
{
__tlb_flush_local();
}
@@ -456,6 +456,7 @@ static int smp_rescan_cpus_sigp(cpumask_t avail)
if (cpu_known(cpu_id))
continue;
__cpu_logical_map[logical_cpu] = cpu_id;
+ smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
if (!cpu_stopped(logical_cpu))
continue;
cpu_set(logical_cpu, cpu_present_map);
@@ -489,6 +490,7 @@ static int smp_rescan_cpus_sclp(cpumask_t avail)
if (cpu_known(cpu_id))
continue;
__cpu_logical_map[logical_cpu] = cpu_id;
+ smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
cpu_set(logical_cpu, cpu_present_map);
if (cpu >= info->configured)
smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY;
@@ -503,7 +505,7 @@ out:
return rc;
}
-static int smp_rescan_cpus(void)
+static int __smp_rescan_cpus(void)
{
cpumask_t avail;
@@ -568,7 +570,7 @@ out:
kfree(info);
printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus);
get_online_cpus();
- smp_rescan_cpus();
+ __smp_rescan_cpus();
put_online_cpus();
}
@@ -846,6 +848,7 @@ void __init smp_prepare_boot_cpu(void)
S390_lowcore.percpu_offset = __per_cpu_offset[0];
current_set[0] = current;
smp_cpu_state[0] = CPU_STATE_CONFIGURED;
+ smp_cpu_polarization[0] = POLARIZATION_UNKNWN;
spin_lock_init(&(&__get_cpu_var(s390_idle))->lock);
}
@@ -887,8 +890,8 @@ static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
if (val != 0 && val != 1)
return -EINVAL;
- mutex_lock(&smp_cpu_state_mutex);
get_online_cpus();
+ mutex_lock(&smp_cpu_state_mutex);
rc = -EBUSY;
if (cpu_online(cpu))
goto out;
@@ -897,28 +900,60 @@ static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
case 0:
if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) {
rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]);
- if (!rc)
+ if (!rc) {
smp_cpu_state[cpu] = CPU_STATE_STANDBY;
+ smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
+ }
}
break;
case 1:
if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) {
rc = sclp_cpu_configure(__cpu_logical_map[cpu]);
- if (!rc)
+ if (!rc) {
smp_cpu_state[cpu] = CPU_STATE_CONFIGURED;
+ smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
+ }
}
break;
default:
break;
}
out:
- put_online_cpus();
mutex_unlock(&smp_cpu_state_mutex);
+ put_online_cpus();
return rc ? rc : count;
}
static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
#endif /* CONFIG_HOTPLUG_CPU */
+static ssize_t cpu_polarization_show(struct sys_device *dev, char *buf)
+{
+ int cpu = dev->id;
+ ssize_t count;
+
+ mutex_lock(&smp_cpu_state_mutex);
+ switch (smp_cpu_polarization[cpu]) {
+ case POLARIZATION_HRZ:
+ count = sprintf(buf, "horizontal\n");
+ break;
+ case POLARIZATION_VL:
+ count = sprintf(buf, "vertical:low\n");
+ break;
+ case POLARIZATION_VM:
+ count = sprintf(buf, "vertical:medium\n");
+ break;
+ case POLARIZATION_VH:
+ count = sprintf(buf, "vertical:high\n");
+ break;
+ default:
+ count = sprintf(buf, "unknown\n");
+ break;
+ }
+ mutex_unlock(&smp_cpu_state_mutex);
+ return count;
+}
+static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL);
+
static ssize_t show_cpu_address(struct sys_device *dev, char *buf)
{
return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]);
@@ -931,6 +966,7 @@ static struct attribute *cpu_common_attrs[] = {
&attr_configure.attr,
#endif
&attr_address.attr,
+ &attr_polarization.attr,
NULL,
};
@@ -1052,17 +1088,17 @@ out:
}
#ifdef CONFIG_HOTPLUG_CPU
-static ssize_t __ref rescan_store(struct sys_device *dev,
- const char *buf, size_t count)
+
+int smp_rescan_cpus(void)
{
cpumask_t newcpus;
int cpu;
int rc;
- mutex_lock(&smp_cpu_state_mutex);
get_online_cpus();
+ mutex_lock(&smp_cpu_state_mutex);
newcpus = cpu_present_map;
- rc = smp_rescan_cpus();
+ rc = __smp_rescan_cpus();
if (rc)
goto out;
cpus_andnot(newcpus, cpu_present_map, newcpus);
@@ -1073,13 +1109,59 @@ static ssize_t __ref rescan_store(struct sys_device *dev,
}
rc = 0;
out:
- put_online_cpus();
mutex_unlock(&smp_cpu_state_mutex);
+ put_online_cpus();
+ if (!cpus_empty(newcpus))
+ topology_schedule_update();
+ return rc;
+}
+
+static ssize_t __ref rescan_store(struct sys_device *dev, const char *buf,
+ size_t count)
+{
+ int rc;
+
+ rc = smp_rescan_cpus();
return rc ? rc : count;
}
static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store);
#endif /* CONFIG_HOTPLUG_CPU */
+static ssize_t dispatching_show(struct sys_device *dev, char *buf)
+{
+ ssize_t count;
+
+ mutex_lock(&smp_cpu_state_mutex);
+ count = sprintf(buf, "%d\n", cpu_management);
+ mutex_unlock(&smp_cpu_state_mutex);
+ return count;
+}
+
+static ssize_t dispatching_store(struct sys_device *dev, const char *buf,
+ size_t count)
+{
+ int val, rc;
+ char delim;
+
+ if (sscanf(buf, "%d %c", &val, &delim) != 1)
+ return -EINVAL;
+ if (val != 0 && val != 1)
+ return -EINVAL;
+ rc = 0;
+ get_online_cpus();
+ mutex_lock(&smp_cpu_state_mutex);
+ if (cpu_management == val)
+ goto out;
+ rc = topology_set_cpu_management(val);
+ if (!rc)
+ cpu_management = val;
+out:
+ mutex_unlock(&smp_cpu_state_mutex);
+ put_online_cpus();
+ return rc ? rc : count;
+}
+static SYSDEV_ATTR(dispatching, 0644, dispatching_show, dispatching_store);
+
static int __init topology_init(void)
{
int cpu;
@@ -1093,6 +1175,10 @@ static int __init topology_init(void)
if (rc)
return rc;
#endif
+ rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+ &attr_dispatching.attr);
+ if (rc)
+ return rc;
for_each_present_cpu(cpu) {
rc = smp_add_present_cpu(cpu);
if (rc)
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-19 21:15:33 +0000